The TVT test station is a variable intensity image projector that projects images of some standard targets to the tested VIS-NIR camera. The tested  camera generates copies of the projected images. Quality of the images generated by the camera is evaluated and its important characteristics are measured. The TVT test systems are built from the following blocks: DAL series calibrated light source, set of targets, rotary wheel, set of exchangeable refractive/reflective collimators, PC, frame grabber, TAS-V software, OS stage. The TVT test systems are recommended for testing VIS-NIR cameras used for medium/long distance surveillance. The TVT test systems can be delivered in several versions optimised to different applications of tested VIS-NIR  cameras (day, night, day/night) and different camera design.

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When the positive cycle of the AC comes into the system, D1 and D2 are forward biased and D3 and D4 are reversed biased therefore current will flow only through D1 and D2. While in the negative half cycle D3 and D4 are forward biased while D1 and D2 are reversed biased, hence current flows through D3 and D4.

I really agree with you a power supply is very crucial for any electronics Project. You're going to definitely see more post from me on electronics

bread board a 12v step-down transformer 7805 voltage regulator capacitors Diodes In other to build this power supply we are going to follow these simple steps to build it

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Testing surveillance VIS-NIR cameras is not standardized. However, these cameras are typically characterized using the following parameters: Resolution, Minimal Resolvable Contrast, MTF, Distortion, FOV, Sensitivity, SNR, Noise Equivalent Input, Fixed Pattern Noise, Non Uniformity, 1/f noise, 3D Noise, Number of bad pixels and bad pixel localisation, Resposivity function (Responsivity, Linearity, Dynamic, Light Range), Color fidelity. More details in  Educational section.

VINIS system can be treated as a simplified version of TVT system. In detail, it is a cost effective solution for testing VIS-NIR cameras and SWIR imagers. It is based on manual halogen light source coded as LS-MAH (non calibrated in basic version) in contrast to computerized calibrated DAL light source. Next, targets are manually inserted when in TVT system targets are automatically exchanged using MRW-8 rotary wheel. Finally, VINIS is typically delivered as an image projector without PC and test software (it is assumed that these blocks are delivered by customer if needed). All these changes in design have enabled significant price reduction comparing to typical TVT test system. At the same time LS-MAH light source is offered in a series of versions and this feature enables to optimize VINIS to different applications.

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Surveillance VIS-NIR cameras  based on CCD/CMOS/ ICCD/ EMCCD/EBAPS imaging sensors  sensitive in visible and near infrared range(VIS-NIR) are widely used in many long range surveillance applications as independent imagers or as part of a bigger multi-sensor surveillance systems.  Majority of VIS-NIR cameras are used for day level applications but an increasing number of these cameras is used to enable surveillance in both night and day conditions. In both cases it is important to verify performance of these cameras under varying illumination conditions from very dark nights to ultra bright days. Important missions can fail due to too low sensitivity of VIS-NIR cameras at night conditions (dark, noisy images) or due to too low dynamic at ultra bright day conditions (saturated, blurred images). Next, it is important to use VIS-NIR cameras that generate high quality images in order to enable detection, recognitio.

Just as it sounds, rectification is the process of converting alternating current to direct current. To carry out this process, we are going to make use of a bridge rectifier. A bridge rectifier consist of four diodes some bridge rectifiers have now been made into a single chip. Diodes are semiconductor materials that allows currently to flow only in One Direction (which is usually in the forward dirction), thereby removing the negative cycle of the alternating current, thus producing a fluctuating DC. The small silver band on the diode represent the cathode. And the large black band represent the anode.

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for those of us who have a 9-0-9 trans former, Peak voltage =9×√2 =9×1.4142 =12.7278v Voltage drop across diodes =1.4 as we established above. V=12.7278 - 1.4 =11.3278v 11.3278 - 7 Hence V=4.3278 From C=I×(T/V) C=500mA×(10ms/4.3278) =1154.7uf But we don't have this kind of value for a capacitor so we approximate to 1000uf. Hence C =1000uf.

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Hello Steemians I did a post last week on how to trouble shoot your car battery. you can look it up here. Today am going to be posting on how to build your own 5volt power supply. Maybe you might have had a damaged charger and then you wished you could just build a temporary one before you are able to get a new one or maybe you are like me who loves electronics so much and then you begin to get worried that you are spending too much on batteries, don't worry because this post is going to guild you on how to build a 5volt power supply for your projects. The components needed to carry out this project are going to be as follows;

Testing VIS-NIR cameras is needed to enable proper quality control, design improvements, maintenance and repairing.  Proper testing is particularly important in case of  expensive ultra long range cameras built using big optical zoom objectives.

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Ahh I have so many things I wanted to fix. I just hot air reworked an onboard lan chip. BUt i can't figure out what's wrong as there's no led light for gigabit connection. That's my dilemma for now haha.

now the voltage from the main, that is from your sockets at home is usually very high. Here in Nigeria it ranges from 220-240v and on some occasions 250v. In other to step down this voltage we are going to use a step down transformer (preferably 12v), by simply connecting the primary wire of the transformer to the main and the secondary to your bread board.

The VLOF measuring set is a mobile variable distance measuring system that project images of a set of standard targets directly to the tested VIS/NIR camera. The tested camera generates a distorted copies of the projected images. Quality of the images generated by the VIS-NIR camera is evaluated and its important characteristics are measured.

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TVT stations  are characterized by a series of technical partameters that makes them superior on international market and TVT system have become favorite choice for both manufacturers, reseach teams  or final users of long/medium range VIS-NIR cameras.

Dude totally love your post. Im new to this electronic field. This article is so useful for all electronic newbie out there. Cause i believe every tinkerer must start with building your own power supply. Its the most basic. Great jib with your explanations. I do hope more such post from you.